code: def test_collapse_over_string_values(self):
      g = get_collapse_graph(as_string=True)
      g2 = g.collapse(
          node="0",
          attribute="1",
          column="level",
          unwrap=False,
          verbose=True,
      )
      self._test_graph_collapse(g, g2)
  
file_path: pygraphistry/graphistry/tests/test_compute_collapse.py
imports: import pandas
  from common import NoAuthTestCase
  from graphistry.tests.test_compute import CGFull
label_desc: Use image node_id 3 for calling the TestCollapse obj's underlying member method code with example usage: obj.test_collapse_over_string_values() without return types